SIS SS 436 21 45-1980 High-voltage metal-enclosed switchgear for rated voltages of 72 5 k V and above《额定电压在72 5 k V及以上的高压金属封闭开关设备》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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